The families of a young pregnant California woman murdered in Hawaii and her missing boyfriend fear that he too may have been killed.

Boaz Johnson, 22, is a suspect in the murder of his girlfriend Brittany Royal, 25, but he has not been seen since before Royal's body was discovered strangled and dumped in the ocean on the coast off Hawaii's Big Island.

'We're definitely concerned that he was also murdered alongside Brittany. It's very possible her body showed up and his didn't,' Boaz Johnson's sister Sarah Johnson said.

Confession: Brittany Royal, 25, was murdered in Hawaii in May and her boyfriend, Bo Johnson, 22, vanished. Police have now found his body and reportedly a three-page hand written confession

'It just seems all too easy to blame someone who isn't even here, may not even be alive to defend himself.'

Royal's body was found in May this year and there has been no sign of Johnson in the seven months since.

Neither family knows what to believe and are finding it difficult to grieve without knowing what happened to Brittany and Bo.

Brittany
Jane Royal was newly pregnant when she was strangled with rope,
dragged across rocks and thrown into the ocean off Kalpana, Hawaii.

Police
initially suspected her missing boyfriend Johnson, but
family members have insisted he had no money to escape or motive to kill
her.

Months later, a
local news site received a cryptic note suggesting Johnson, known to his
friends and family as 'Bo', had also been killed amid racial tensions.

Now the Royal and Johnson families have been left with little to go on and no further to finding out exactly what happened to their loved ones.